Master collet for machine tools



FIG. 1 is a side elevational view of a master collet for machine tools embodying my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof, taken from the side opposite to that shown in FIG. 1. 

The ornamental design for a master collet for machine tools, as shown. 